The surface chemistry of the materials in terms of
The photocatalytic degradation of methanol has been studied in discontinuous mode for all the nanostructured membranes, in order to compare the catalytic performance and to evaluate the effect of graphene on the kinetic of reaction. Blank experiments at the same conditions shown that no activity is observed in the absence of photocatalyst or light irradiation. All the experiments were replicated on three sets of each membrane type, for statistical significance and three consecutive cycles of photo-degradation have been run for all the membranes, in order to estimate the lifetime of these active filter media. Every Maraviroc consists of a conditioning step, a reaction step and a regenerative step. Fig. 9 reports the comparison of methanol photo-degradation during the experiment time (fixed at 300 min) of all the nanostructured membranes, that is Type A (pristine TiO2 as photocatalyst), Type B (with the co-photocatalyst graphene), and Type C (with the composite photocatalytic system graphene-TiO2), with respect the initial concentration. As cork cambium can be observed for membrane Type A, at the beginning of the experiment, which correspond to the lighting of the UV lamp, an increase of methanol concentration has been recorded. This behavior has been hypothesized to be related to methanol-desorption, which is predominant to degradation in the first stage of the photocatalytic reaction. After the first sampling, the reaction the methanol degradation was observed and the maximum conversion reached after 300 min of experiment was 80%.